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Subject[PATCH 2/6] hid: egalax: Setup input device manually
Date
The hid core does not yet handle input filtering. Take over the setup
of the input device, so that proper signal-to-noise ratios can be
used.

Signed-off-by: Henrik Rydberg <rydberg@euromail.se>
---
drivers/hid/hid-egalax.c | 37 +++++++++++++++++++++++++------------
1 files changed, 25 insertions(+), 12 deletions(-)
diff --git a/drivers/hid/hid-egalax.c b/drivers/hid/hid-egalax.c
index 5a1b52e..23f832b 100644
--- a/drivers/hid/hid-egalax.c
+++ b/drivers/hid/hid-egalax.c
@@ -25,6 +25,8 @@ MODULE_LICENSE("GPL");

#include "hid-ids.h"

+#define MAX_EVENTS 120
+
struct egalax_data {
__u16 x, y, z;
__u8 id;
@@ -34,10 +36,21 @@ struct egalax_data {
__u16 lastx, lasty, lastz; /* latest valid (x, y, z) in the frame */
};

+static void set_abs(struct input_dev *input, unsigned int code,
+ struct hid_field *field, int snratio)
+{
+ int fmin = field->logical_minimum;
+ int fmax = field->logical_maximum;
+ int fuzz = snratio ? (fmax - fmin) / snratio : 0;
+ input_set_abs_params(input, code, fmin, fmax, fuzz, 0);
+}
+
static int egalax_input_mapping(struct hid_device *hdev, struct hid_input *hi,
struct hid_field *field, struct hid_usage *usage,
unsigned long **bit, int *max)
{
+ struct input_dev *input = hi->input;
+
switch (usage->hid & HID_USAGE_PAGE) {

case HID_UP_GENDESK:
@@ -45,18 +58,16 @@ static int egalax_input_mapping(struct hid_device *hdev, struct hid_input *hi,
case HID_GD_X:
hid_map_usage(hi, usage, bit, max,
EV_ABS, ABS_MT_POSITION_X);
+ set_abs(input, ABS_MT_POSITION_X, field, 0);
/* touchscreen emulation */
- input_set_abs_params(hi->input, ABS_X,
- field->logical_minimum,
- field->logical_maximum, 0, 0);
+ set_abs(input, ABS_X, field, 0);
return 1;
case HID_GD_Y:
hid_map_usage(hi, usage, bit, max,
EV_ABS, ABS_MT_POSITION_Y);
+ set_abs(input, ABS_MT_POSITION_Y, field, 0);
/* touchscreen emulation */
- input_set_abs_params(hi->input, ABS_Y,
- field->logical_minimum,
- field->logical_maximum, 0, 0);
+ set_abs(input, ABS_Y, field, 0);
return 1;
}
return 0;
@@ -66,6 +77,7 @@ static int egalax_input_mapping(struct hid_device *hdev, struct hid_input *hi,
case HID_DG_TIPSWITCH:
/* touchscreen emulation */
hid_map_usage(hi, usage, bit, max, EV_KEY, BTN_TOUCH);
+ input_set_capability(input, EV_KEY, BTN_TOUCH);
return 1;
case HID_DG_INRANGE:
case HID_DG_CONFIDENCE:
@@ -75,14 +87,15 @@ static int egalax_input_mapping(struct hid_device *hdev, struct hid_input *hi,
case HID_DG_CONTACTID:
hid_map_usage(hi, usage, bit, max,
EV_ABS, ABS_MT_TRACKING_ID);
+ set_abs(input, ABS_MT_TRACKING_ID, field, 0);
+ input_set_events_per_packet(input, MAX_EVENTS);
return 1;
case HID_DG_TIPPRESSURE:
hid_map_usage(hi, usage, bit, max,
EV_ABS, ABS_MT_PRESSURE);
+ set_abs(input, ABS_MT_PRESSURE, field, 0);
/* touchscreen emulation */
- input_set_abs_params(hi->input, ABS_PRESSURE,
- field->logical_minimum,
- field->logical_maximum, 0, 0);
+ set_abs(input, ABS_PRESSURE, field, 0);
return 1;
}
return 0;
@@ -96,10 +109,10 @@ static int egalax_input_mapped(struct hid_device *hdev, struct hid_input *hi,
struct hid_field *field, struct hid_usage *usage,
unsigned long **bit, int *max)
{
+ /* tell hid-input to skip setup of these event types */
if (usage->type == EV_KEY || usage->type == EV_ABS)
- clear_bit(usage->code, *bit);
-
- return 0;
+ set_bit(usage->type, hi->input->evbit);
+ return -1;
}

/*
--
1.7.1


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